Question

Q.8 :-The sum all even natural numbers between 1 and 31 is
16
KOD 128
240
512​

Answer 1

Answer:

OPTION C

Step-by-step explanation:

• Let Sn = (2 + 4 + 6 + ..... + 30). This is an A.P. in which a = 2, d = 2 and l = 30
• Let Sn = (2 + 4 + 6 + ..... + 30). This is an A.P. in which a = 2, d = 2 and l = 30Let the number of terms be n Then,
• Let Sn = (2 + 4 + 6 + ..... + 30). This is an A.P. in which a = 2, d = 2 and l = 30Let the number of terms be n Then,a + (n - 1)d = 30
• Let Sn = (2 + 4 + 6 + ..... + 30). This is an A.P. in which a = 2, d = 2 and l = 30Let the number of terms be n Then,a + (n - 1)d = 30⇒ 2 + (n - 1) x 2 = 30
• Let Sn = (2 + 4 + 6 + ..... + 30). This is an A.P. in which a = 2, d = 2 and l = 30Let the number of terms be n Then,a + (n - 1)d = 30⇒ 2 + (n - 1) x 2 = 30⇒ n = 15
• Let Sn = (2 + 4 + 6 + ..... + 30). This is an A.P. in which a = 2, d = 2 and l = 30Let the number of terms be n Then,a + (n - 1)d = 30⇒ 2 + (n - 1) x 2 = 30⇒ n = 15∴Sn=n2(a+I)=152×(2+30)=15×16=240