Thank you for registering.

One of our academic counsellors will contact you within 1 working day.

Please check your email for login details.
MY CART (5)

Use Coupon: CART20 and get 20% off on all online Study Material

ITEM
DETAILS
MRP
DISCOUNT
FINAL PRICE
Total Price: Rs.

There are no items in this cart.
Continue Shopping

if a 1 =2 and a n -a n-1 =2n(n>=2), find the value of a 1 +a 2 +a 3 +.....+a 20.

if a1=2 and an-an-1=2n(n>=2), find the value of a1+a2+a3+.....+a20.

Grade:11

1 Answers

bhawani
33 Points
6 years ago
420
tn= 2 + { 4 + 6 + 8 + 10 + – – – –   + 19 terms}
=2 + 19/2{2.4 + (19 – 1 )2}
2 + 19/2{ 8 + 36}
=420

Think You Can Provide A Better Answer ?

Provide a better Answer & Earn Cool Goodies See our forum point policy

ASK QUESTION

Get your questions answered by the expert for free