Question

In the month of March, Mr Shenvi spent 1 on the first day, 3 on the second day, 5 on the third day and so on. What is his total expenditure for the whole month ?
pls answer do​

Answer 1

Step-by-step explanation:

Mohan's savings are Rs. 1, Rs. 2, Rs. 3,....

Here, t

1

=1, n=40

Therefore, t

n

=t

40

=20; S

n

=S

40

=?

⇒S

n

=

2

n

(t

1

+t

n

)

⇒S

40

=

2

40

(1+40)

⇒S

40

=

2

40

×41=820

Hence, Mohan's total savings after 40 days will be Rs. 820.