Question

3. Find the sum of 3 + 11 + 19 + - - - -+ 803.
4. Find the tenth term of the sequence √2, √8, √18, ……
{ Hint : given terms are √2, 2√2, 3√2…….}
5. How many terms are there in the A.P 3,7,11……………407

pls ans for next question will be 20 pts

Answer 1

Answer:

3.1/2(a+l)

1/2(3+803)

1/2×806

=403

4.d=1

a=

$2 \sqrt[?]{?}$

a10=square root 2+9

Answer 2

Answer:

3. 40703,

4. 10√2,

5. 102

Step-by-step explanation:

3. Sum of 3+11+19+...+803

This is AP, where

• a=3,

• d=11-3=8,

• n=1+(803-3)/8= 101

• Sₙ=1/2*101*(3+803)= 40703

• Sₙ=40703

====

4. Find the tenth term of the sequence √2, √8, √18, …

• 1√2, 2√2, 3√2,..., 10√2

• 10th term = 10√2

===

5. How many terms are there in the A.P 3,7,11……………407

• d= 7-3=4

• n=1+(407-3)/4= 102

Number of terms is 102