the sum of all consecutive number s lying between 60 and 75 is?
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1
Answer:
945
Step-by-step explanation
61+62+63+...........+74
a = 61 (first term)
l = 74 (last term)
d = 1 (common difference of the A.P)
n = (74-61)+1 = 14
∴ sum is given by
Sₙ = n/2 (a+l)
= 14/2(61+74)
= 7(135)
= 945
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