Math, asked by mayanksingh83584, 1 year ago

an ap 5,12,19....has 50terms .find its last term .hence find the sum of its last 15 tems​

Answers

Answered by afsheen1308
2

Answer

Step-by-step explanation:

AP=5,12,19.........

a=5

d=12-5

=7

n=50

l =a+(n-1)d

l =5+(50-1)7

l =5+(49)7

l =5+343

l =348

last term =348

S15 =n/2 (a +l)

S15= 50/2(5+348)

S15=25(353)

S15= 8825.

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