20.The decimal expansion of the rational number 74/〖2^3.5〗^4 will terminate after Places
21.Write whether (2√45+3√20)/(2√5) on simplification give a rational or an irrational number.
22. Find the zeroes of the polynomial and verify the relationship between the zeroes and the coefficient
a) 4x2 + 1 – 4x b) x2 – 3 c) 4x2 – 7 d) √3x2 – 8x + 4√3
23.Find the polynomial, whose zeroes are 2 + √3 and 2 - √3
24.Form a quadratic polynomial, one of whose zero is 2 + √5 and the sum of zeroes is 4
25.Find a quadratic polynomial whose sum and product of the zeroes are 21/8 and 5/16
Answers
Answer:
(ii) E: at least two heads F : at most two heads
(iii) E: at most two tails F: at least one tail
Solution:
NCERT Solutions Class 12 Maths Chapter 13 Probability Ex 13.1 Q 6
Ex 13.1 Class 12 Maths Question 7.
Two coins are tossed once
(i) E: tail appears on one coin F: one coin shows head
(ii) E: no tail appears F: no head appears.
Solution:
NCERT Solutions Class 12 Maths Chapter 13 Probability Ex 13.1 Q 7
Ex 13.1 Class 12 Maths Question 8.
A die is thrown three times.
E: 4 appears on the third toss
F: 6 and 5 appears respectively on first two tosses.
Solution:
Class 12 Maths NCERT Solutions Chapter 13 Probability Ex 13.1 Q 8
Ex 13.1 Class 12 Maths Question 9.
Mother, father and son line up at random for a family picture:
E: son on one end, F: father in middle
Solution:
Class 12 Maths NCERT Solutions Chapter 13 Probability Ex 13.1 Q 9
Ex 13.1 Class