Question

Find the sum of 24 terms of the AP 1,3,5,7,....

Answer 1

Answer:

576

Step-by-step explanation:

a= 1

c.d= 3 - 1 = 2

n = 24

Sum of 24 terms = n/2{2a + (n - 1) x c.d}

                            = 24/2 { 2 x 1 + (24 - 1) x 2}

                            = 12 x { 2 + 23 x 2}

                            = 12 x 48

                            = 576 (Answer)

                       

                         --------------- Hope it helps you --------------

Answer 2

Answer:

AP: 1,3,5,7,...

a = 1

n=24

d= a2-a1

= 3-1

= 2

Sn = n/2 [2a + (n-1)d]

S24 = 24/2 [2(1)+ (24-1)×2]

S24 = 12 [2 + 23×2]

S24 = 12 [2 + 46]

S24 = 12×48

S24= 576

Hope this helps you..!!