find the sum of first 50 terms of A.P=5,10,15,20
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d=5
Step-by-step explanation:
d=T2-T1
d=10-5
d=5
Answered by
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Answer:
AP: 5,10,15,20.....
a= 5
d= 5
n= 50
Sn= n/2 [2a + (n-1)d]
= 50/2 [2 (5) + (50-1)(5)]
= 25 [ 10 + (49)(5)]
= 25 [ 10+ 245]
= 25 [ 255]
= 495
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