Question

find the sum of all integers between 50 and 500 which are divisible by 7

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Answer 1

Answer:

15960

Step-by-step explanation:

a=56,nth=497

nth= a+(n-1)×d

497= 56(n-1)7

441= (n-1)7

63= n-1

or, n=64

Sn= n/2×(a+last term)

Sn= 32× (56+497)

Sn= 32×553

Sn= 15,960

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