Question

find the sum of all integers between 50 and 350 which end 1​

Answer 1

Answer

5880

Explaination

a=51

a=51d=10

a=51d=10n

a=51d=10n th

a=51d=10n th term =341

a=51d=10n th term =341∴51+(n−1)10=341

a=51d=10n th term =341∴51+(n−1)10=341⇒n=30

a=51d=10n th term =341∴51+(n−1)10=341⇒n=30∴Sum=

a=51d=10n th term =341∴51+(n−1)10=341⇒n=30∴Sum= 2

a=51d=10n th term =341∴51+(n−1)10=341⇒n=30∴Sum= 230

a=51d=10n th term =341∴51+(n−1)10=341⇒n=30∴Sum= 230

a=51d=10n th term =341∴51+(n−1)10=341⇒n=30∴Sum= 230 [2.51+(30−1)10]=5880

Answer 2

Answer:

A=50,an=350

An=a+(n-1)d

350=50+n-1)1

300=n-1

n=301