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Sum or Product

Last Updated: 3 Dec, 2020
Difficulty: Easy


Try Problem

You are given a number ‘N’ and a query ‘Q.’ If ‘Q’ is 1, then you have to return the sum of all integers from 1 to ‘N,’ else if ‘Q’ is equal to 2 then you have to return the product of all integers from 1 to ‘N.’ Since the product can be very large, return it modulo 10 ^ 9 + 7.

For example

Given ‘N’ = 4, ‘Q’ = 1. 
Then the answer is 10 because the sum of all integers between 1 and 4 are 1, 2, 3, and 4. Hence 1 + 2 + 3 + 4 is equal to 10.
Input format:
The first line of input contains an integer ‘T’ denoting the number of test cases.

Next, ‘T’ lines contain two space-separated integers ‘N’, where ‘N’ is the number given and ‘Q’, denoting the type of query.
Output Format :
For each test case, You are supposed to return an integer denoting the sum or product of ‘N’ numbers.
You are not required to print the expected output; it has already been taken care of. Just implement the function.
1 <= ‘T’ <= 10
1 <= ‘N’ <= 10^4
1 <= ‘Q’ <= 2

Time Limit: 1 sec.